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1.\" $OpenBSD: BN_copy.3,v 1.10 2021/12/06 19:45:27 schwarze Exp $
2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>
5.\" and Matt Caswell <matt@openssl.org>.
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52.Dd $Mdocdate: December 6 2021 $
53.Dt BN_COPY 3
54.Os
55.Sh NAME
56.Nm BN_copy ,
57.Nm BN_dup ,
58.Nm BN_with_flags
59.Nd copy BIGNUMs
60.Sh SYNOPSIS
61.In openssl/bn.h
62.Ft BIGNUM *
63.Fo BN_copy
64.Fa "BIGNUM *to"
65.Fa "const BIGNUM *from"
66.Fc
67.Ft BIGNUM *
68.Fo BN_dup
69.Fa "const BIGNUM *from"
70.Fc
71.Ft void
72.Fo BN_with_flags
73.Fa "BIGNUM *dest"
74.Fa "const BIGNUM *b"
75.Fa "int flags"
76.Fc
77.Sh DESCRIPTION
78.Fn BN_copy
79copies
80.Fa from
81to
82.Fa to .
83.Pp
84.Fn BN_dup
85creates a new
86.Vt BIGNUM
87containing the value
88.Fa from .
89.Pp
90.Fn BN_with_flags
91creates a
92.Em temporary
93shallow copy of
94.Fa b
95in
96.Fa dest .
97It places significant restrictions on the copied data.
98Applications that do not adhere to these restrictions
99may encounter unexpected side effects or crashes.
100For that reason, use of this function is discouraged.
101.Pp
102Any flags provided in
103.Fa flags
104will be set in
105.Fa dest
106in addition to any flags already set in
107.Fa b .
108For example, this can be used to create a temporary copy of a
109.Vt BIGNUM
110with the
111.Dv BN_FLG_CONSTTIME
112flag set for constant time operations.
113.Pp
114The temporary copy in
115.Fa dest
116will share some internal state with
117.Fa b .
118For this reason, the following restrictions apply to the use of
119.Fa dest :
120.Bl -bullet
121.It
122.Fa dest
123should be a newly allocated
124.Vt BIGNUM
125obtained via a call to
126.Xr BN_new 3 .
127It should not have been used for other purposes or initialised in any way.
128.It
129.Fa dest
130must only be used in "read-only" operations, i.e. typically those
131functions where the relevant parameter is declared "const".
132.It
133.Fa dest
134must be used and freed before any further subsequent use of
135.Fa b .
136.El
137.Sh RETURN VALUES
138.Fn BN_copy
139returns
140.Fa to
141on success or
142.Dv NULL
143on error.
144.Fn BN_dup
145returns the new
146.Vt BIGNUM
147or
148.Dv NULL
149on error.
150The error codes can be obtained by
151.Xr ERR_get_error 3 .
152.Sh SEE ALSO
153.Xr BN_new 3 ,
154.Xr BN_set_flags 3
155.Sh HISTORY
156.Fn BN_copy
157and
158.Fn BN_dup
159first appeared in SSLeay 0.5.1 and have been available since
160.Ox 2.4 .
161.Pp
162.Fn BN_with_flags
163first appeared in OpenSSL 0.9.7h and 0.9.8a
164and has been available since
165.Ox 4.0 .
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